code: def retrieve_lr(optimizer) -> list:
      lr_list = []
      for param_group in optimizer.param_groups:
          lr_list.append(param_group["lr"])
      return lr_list
  
file_path: ml-cvnets/optim/scheduler/base_scheduler.py
imports: import argparse
  from utils import logger
label_desc: Use image node_id 5 for calling the BaseLRScheduler obj's underlying member method code with example usage: obj.retrieve_lr(optimizer) and returns: lr_list